/**
 * 
 */
package com.mvn.account.persist;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentFactory;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

/**
 *
 * @author wanghy
 * @since 2014-2-19
 * 
 */
public class AccountPersistServiceImpl implements AccountPersistService {
	
	private static final String ELEMENT_ROOT = "account-persist";

	private static final String ELEMENT_ACCOUNTS = "accounts";
	
	private static final String ELEMENT_ACCOUNT_ID = "id";
	
	private static final String ELEMENT_ACCOUNT_NAME = "name";
	
	private static final String ELEMENT_ACCOUNT_EMAIL = "email";
	
	private static final String ELEMENT_ACCOUNT_PASSWORD = "password";

	private static final String ELEMENT_ACCOUNT_ACTIVATED = "activated";
	
	private String file;
	
	private SAXReader reader = new SAXReader();
	
	private Document readDocument() throws AccountPersistException {
		File dataFile = new File(file);
		
		if (!dataFile.exists()) {
			dataFile.getParentFile().mkdirs();
			Document doc = DocumentFactory.getInstance().createDocument();
			Element rootEle = doc.addElement(ELEMENT_ROOT);
			rootEle.addElement(ELEMENT_ACCOUNTS);
			writeDocument(doc);
		}
		
		try {
			return reader.read(new File(file));
		} catch (DocumentException e) {
			throw new AccountPersistException("Unable to read persist data xml", e);
		}
	}
	
	private void writeDocument(Document doc) throws AccountPersistException {
		Writer out = null;
		try {
			out = new OutputStreamWriter(new FileOutputStream(file), "utf-8");
			XMLWriter writer = new XMLWriter(out, OutputFormat.createPrettyPrint());
			writer.write(doc);
		} catch (IOException e) {
			throw new AccountPersistException("Unable to read persist data xml", e);
		} finally {
			try {
				if (out != null) {
					out.close();
				}
			} catch (IOException e) {
				throw new AccountPersistException("Unable to read persist data xml", e);
			}
		}
	}

	public Account createAccount(Account account)
			throws AccountPersistException {
		return account;
	}

	public Account readAccount(String id) throws AccountPersistException {
		Document doc = readDocument();
		Element accountsEle = doc.getRootElement().element(ELEMENT_ACCOUNTS);
		for (Element accountEle : (List<Element>)accountsEle.elements()) {
			if (accountEle.elementText(ELEMENT_ACCOUNT_ID).equals(id)) {
				return buildAccount(accountEle);
			}
		}
		return null;
	}

	private Account buildAccount(Element element) {
		Account account = new Account();
		
		account.setId(element.elementText(ELEMENT_ACCOUNT_ID));
		account.setName(element.elementText(ELEMENT_ACCOUNT_NAME));
		account.setEmail(element.elementText(ELEMENT_ACCOUNT_EMAIL));
		account.setPassword(element.elementText(ELEMENT_ACCOUNT_PASSWORD));
		account.setActivated("true".equals(element.elementText(ELEMENT_ACCOUNT_ACTIVATED)) ? true : false);
		return account;
	}

	public Account updateAccount(Account account)
			throws AccountPersistException {
		return null;
	}

	public void deleteAccount(String id) throws AccountPersistException {

	}

	/**
	 * @return the file
	 */
	public String getFile() {
		return file;
	}

	/**
	 * @param file the file to set
	 */
	public void setFile(String file) {
		this.file = file;
	}

}
